Method and system to determine erroneous measurement signals during a test measurement sequence
First Claim
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1. A glucose measurement system comprising:
- a biosensor having a plurality of electrodes including at least two electrodes with an enzyme disposed thereon; and
a meter including;
a microcontroller coupled to a power source, memory and the plurality of electrodes of the biosensor and in which the microcontroller is configured to;
drive a signal to the at least two electrodes when a fluid sample comprising glucose is deposited proximate the at least two electrodes to start a test measurement sequence for an electrochemical reaction of the glucose in the fluid sample with the enzyme;
measure an output signal from at least one electrode during the electrochemical reaction over a series of time instances to obtain a magnitude of the output signal for each time instance;
determine an output differential as a difference in the respective magnitudes of the output signal for two consecutive time instances, at least one of the two consecutive time instances being within a predetermined time window during the test measurement sequence;
if the output differential is greater than zero then(1) increment a first index by one and(2) set a second index value as equal tothe sum of a previous value of the second index and the output differentialandif the first index is greater or equal to a first threshold andthe second index is greater than a second thresholdthen annunciate an errorotherwise if one of the two consecutive time instances is outside of the predetermined time window then calculate a glucose value from the output signal and annunciate the glucose value.
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Abstract
Various embodiments that allow a more accurate electrochemical test strip measurement by identifying erroneous output signals during a glucose measurement thereby ensuring a much more accurate glucose test system.
2 Citations
12 Claims
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1. A glucose measurement system comprising:
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a biosensor having a plurality of electrodes including at least two electrodes with an enzyme disposed thereon; and a meter including; a microcontroller coupled to a power source, memory and the plurality of electrodes of the biosensor and in which the microcontroller is configured to; drive a signal to the at least two electrodes when a fluid sample comprising glucose is deposited proximate the at least two electrodes to start a test measurement sequence for an electrochemical reaction of the glucose in the fluid sample with the enzyme; measure an output signal from at least one electrode during the electrochemical reaction over a series of time instances to obtain a magnitude of the output signal for each time instance; determine an output differential as a difference in the respective magnitudes of the output signal for two consecutive time instances, at least one of the two consecutive time instances being within a predetermined time window during the test measurement sequence; if the output differential is greater than zero then (1) increment a first index by one and (2) set a second index value as equal to the sum of a previous value of the second index and the output differential and if the first index is greater or equal to a first threshold and the second index is greater than a second threshold then annunciate an error otherwise if one of the two consecutive time instances is outside of the predetermined time window then calculate a glucose value from the output signal and annunciate the glucose value. - View Dependent Claims (2, 3, 4, 5)
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6. A method of determining a glucose value from a fluid sample with a biosensor having at least two electrodes and reagent disposed thereon and a glucose meter having a microcontroller configured to connect to the biosensor and to a memory and a power source, the method comprising the steps of:
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initiating a start of a test measurement sequence upon deposition of a fluid sample proximate the at least two electrodes of the biosensor; applying an input signal to the fluid sample to cause a transformation of glucose into an enzymatic by-product; measuring output signal transient from the fluid sample including over a predetermined time window from the start of the test sequence, the measuring including sampling an output signal from at least one electrode during the electrochemical reaction over a series of time instances to obtain a magnitude of the output signal for each time instance; determining an output differential as a difference in the respective magnitudes of the output signal for two consecutive time instances, at least one of the two consecutive time instances being within the predetermined time window during the test measurement sequence; if the output differential is greater than zero then; (1) incrementing a first index by one and (2) setting a second index value as equal to the sum of a previous value of the second index and the output differential; and if the first index is greater or equal to a first threshold and a second index is greater than a second threshold then annunciating an error, otherwise if one of the two consecutive time instances is greater than the predetermined time window then calculating a glucose value of the fluid sample and annunciating the glucose value. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification